.Markku Reunanen.

ASK Proxima M22, Linux and Resolutions

April 2nd, 2019

I have an ASK Proxima model M22 at my disposal – already an old HD projector with VGA as the main input port. Works ok for my purposes, especially if you crank saturation slightly up with VLC filters or Nvidia settings. The native resolution of the M22 is 1280×800, but unfortunately Linux does not detect it automatically, giving maximum 1024×768 pixels instead (yes, I’ve tried several different computers and cables). Luckily there are two solutions that have solved the issue. Firstly, using an HDMI to VGA converter will solve the detection problem. The other way is to force the resolution with some command line magic:

xrandr --newmode "1280x800" 83.46 1280 1344 1480 1680 800 801 804 828 -HSync +Vsync
xrandr --addmode VGA1 1280x800

Depending on your setup the output name might not be VGA1. Typing plain xrandr will tell you what’s connected. After the two lines you should see the new resolution in your favorite screen mode selector and also the xrandr list. Either use the desktop environment facilities or do this:

xrandr --output VGA1 --mode 1280x800

As a final tip, and so that I remember it myself in the future, the cvt command line tool conveniently calculates these modelines for you (there is also gtf which does exactly the same thing). There’s this online, too.

Filed under: laitteet,linux